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Beam Position Monitore


BPM Diode Type

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Technische Beschreibung


The beam position monitor is used for detecting the position of beams having very small cross sections (intense focussing), which for that reason cannot be measured with staggered pair monitors. They are typically the last monitors before experiments with focussed beams.
Large surface GaAsP photo diodes (Schottky type) in UHV-compatible design will be used as sensors. This is an array made of four photodiodes arranged on the left and on the right as well as above and below the beam.
The photon beam hits a thin high-transmission target foil. Fluorescence photons generate the photo-currents. From the differences between the currents in the four diodes the position of the beam can be established in-situ. The cooled monitor head is made of OFHC copper and can be moved via a power-driven linear manipulator orthogonally to the beam. The manipulator stroke allows the monitor to be completely removed out of the beam. The expected photon flows will be measured using pico-ammeters.

Technische Daten


Energy range: 1 keV … 20 keV

Diode type: GaAsP, Schottky type (Hamamatsu)

Active diode surface: 10.1 mm x 10.1 mm

Target foil: Al, Cr, Ti

Foil thickness: 0.001 mm

Transmission: approx. 95% at 5 keV and 0.001 mm Al

Basic flange: CF 150

Monitor head: OFHC copper

Manipulator stroke: 50 mm vertical

Drive: stepping motor, limit and reference switches

Cooling: OFHC copper pipe, Ø 6x1

Temperature measurement: TC, K-type

Photo-current measurement: 4 pico-ammeters (Keithley 6485 or equivalent)

UHV compatibility: yes


 

BPM for ID Radiation

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Technische Beschreibung


The beam position monitors are based on a development by Dr. Karsten Holldack, BESSY Berlin, in collaboration with FMB.
The beam position monitors use up to four blades, whose narrow fronts are oriented towards the radiation source, to scan the off-axis radiation of the undulator and determine on-line the position of the centre of the insertion device radiation from the emitted signals.
The size and the geometry of the blades will be adapted to the beam characteristics at the place of the position monitor in order to achieve a maximum photocurrent yield at a maximum sensibility and without the disturbing dipole background.
The blades for insertion device applications consist of tungsten and will be actively cooled via heat conducting ceramics to resist the thermal load of the ID radiation.

Technische Daten


Detector head: OFHC-Copper

Blades: 0,2 mm thick, Tungsten

AlN insulators, ZrO washers: 0.5 mm AlN, ZrO-washers

Base flange: NW 150 CF

Stand: Steel, sand filled, polystyrole-insulated

Vertical / horizontal stroke: Up to 20 mm

Electronics: 4 channel-current to DC converter LCAD4,
internal BIAS supply
additional threshold electrode

As options available: Vacuum chamber with bellows
x,y stage
Colum

UHV compatibility: yes



 

BPM ID Komplett | Motorised H-, V- Stage 10 / 10 Column , LCAD and Cables

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Technische Beschreibung


The well-known Beam Position Monitor (BPM)- inserts, described in our datasheets, are preferably to be installed into a complete BPM -unit.
Complete BPM-unit consist of:

  • the BPM-chamber
  • the motorised H- V – Stage and
  • the under frame (column).
The motorised H-V-Stage was developed by FMB.
The unit is able, to adjust the complete pre-set BPM into its accurate measurement position within the beam l ine. Especially the high precision and compactness of the X-Z-stage are remarkable. If required an additional encoder (Manufac turer: AMO, Austria) can be installed in every direction (inside of the stage). As an additional option FBM offers implementation of another special types
of encoder (for example: SLS/PSI). Furthermore, the manual opera tion of the stage is possible. Necessary mechanical limitations are installed.
For a complete package BPM we provide as an under frame a massiv e standard column, which we can fill with sand, too. It is possible to insulate the column against variations in temperature. Customers space conditions can be considered. In this case, the under frame will be designed accordingly.
For the analysis of the detected signals we provide the suitable electronic device LCAD 4 (four channel Low Current Asymmetry Detector). The Low Current / Voltage- Converter LCAD 4 is a useful instrument for the simultaneous determination of the four independent photocurrents between 1nA and 1mA. The beam position can be precisely obtained from the asymmetry of the
measured photocurrents. The generated currents on the blades flo w via double-screened measuring cable into the 4 channels of the LCAD 4, where they are converted into proportional voltages. All 4 measurement circuits are closed to the earth potential via a switchable BIAS- voltage (between +/-280 V - included in this device).
The manufacturer of the LCAD 4 is Messrs. GMS Frank Optic Products GmbH, Berlin. Delivery also includes the special doublescreened measurement cable (length about 20 meters).

Technische Daten


H-, V-Stag e10/10
Length over all ≈ 354,4 mm
Width over all ≈ 195 mm
Height over all ≈ 215,5 mm … 225,5 mm
Stroke Y (horz.) 10 mm
Stroke Z (vert.) 10 mm
Repeat accuracy with Encoder (option) ± 0,001 mm
Repeat accuracy with limit switch ± 0,01 mm
Threaded spindle:
-Dimension M12x1
-Normal backlash 0,02 mm
-Pitch error 0,003 mm…0,008 mm

Stepper motor
Company ORIENTAL
Type High-torque PK-type
No. PK268-E2,0B
Holding Torque 1,35 Nm
Current per Phase 2 A
Voltage 4,5 VDC
Resitance per Phase 2,25 Ω
Angle per fullstep 1,8°
Repeat accuracy with Encoder(optional) ± 0,001mm
Step mode Full / half / micro
Connection motor Connei socket 9 pin
Connection limit switch Connei socket 12 pin

Encoder (option)
Company AMO
Type PMK-02 with 1024 interpolation
Dissolution 1/1024 mm
Signal TTL RS-422
Current 200 mA
Voltage 5 VDC ±5%
Connection Connei plug 12 pin

 

BPM ID Komplett | Additional equipment for BPM, LoCuM-4 and Cables

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Technische Beschreibung


In addition to the Beam Position Monitor,
FMB offers the necessary additional equipment for installation of complete BPM-units:

1. The BPM chamber
- FMB standard solution or according to customer’s specification
- material: 1.4301 or 304, option: 316LN (flanges)

2. The underframe (column)

- massive standard column, filling with sand is recommended
- insulation against variations in temperature
- special design according to space requirements is possible

3. The LoCuM-4 with cables
- for analysis of the detected photon currents
- four-channel low-current monitor and current-voltage converter
- simultaneous determination of the four independent photocurrents between 100 pA and 1mA
- controller for internal switch function – remote mode via RS232
- special double-shielded measurement cable (length about 20 m) is recommended

4. Pinhole Array
- with frame
- installation in dipole BPM

5. Appropriate bellow
- welded bellows ( about 20 membrane pairs (DN35CF) and 30 membrane pairs (DN63CF) ) for motorized stages
- hydroformed bellows for manual adjustment

6. The motorised H-V-Stage
- adjustment of the complete pre-set BPM into its accurate measurement position within the Beamline
- high precision and compactness
- with stepper motor
- encoder is recommended, but manual operation is possible (necessary mechanical limitation is installed)

Technische Daten


H-, V-Stag e10/10
Length over all ≈ 354,4 mm
Width over all ≈ 195 mm
Height over all ≈ 215,5 mm … 225,5 mm
Stroke Y (horz.) 10 mm
Stroke Z (vert.) 10 mm
Repeat accuracy with Encoder (option) ± 0,001 mm
Repeat accuracy with limit switch ± 0,01 mm
Threaded spindle:
-Dimension M12x1
-Normal backlash 0,02 mm
-Pitch error 0,003 mm…0,008 mm

Stepper motor
Company ORIENTAL
Type High-torque PK-type
No. PK268-E2,0B
Holding Torque 1,35 Nm
Current per Phase 2 A
Voltage 4,5 VDC
Resitance per Phase 2,25 Ω
Angle per fullstep 1,8°
Repeat accuracy with Encoder(optional) ± 0,001mm
Step mode Full / half / micro
Connection motor Coninvers RC-09P1N324100
Connection limit switch Coninvers RC-12P1N324100

Encoder (option)
Company Renishaw
Type RGH24
Resolution 5 μm … 0,1μm
Signal TTL RS-422
Current 120 mA (150 mA)
Voltage 5 VDC ±5%
Connection Sub-D 15 Male

 

BPM for Dipole Radiation

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Technische Beschreibung


The beam position monitors are based on a development by Dr. Karsten Holldack, BESSY Berlin, in collaboration with FMB.
The beam position monitors use up to four blades, whose narrow fronts are oriented towards the radiation source, to scan the off-axis radiation of the dipole and determine on-line the position of the centre of the dipole radiation from the emitted signals.
The size and the geometry of the blades will be adapted to the beam characteristics at the place of the position monitor in order to achieve a maximum photocurrent yield at a maximum sensibility.
The blades for dipole applications consist of OFHC copper or Tungsten and will be actively cooled via heat conducting ceramics to resist the thermal load of the dipole radiation.
The beam position monitors are only for vertical diagnostic with the help of 2 staggered blade pairs.

Technische Daten


Detector head: OFHC-Copper (water-cooled)

Blades: Copper; thickness 1.5mm to 3.5mm (in reference to the
distance between Monitor and source point)
(Wiggler-BPM optional 0.2mm Tungsten / Molybdenum).
Optional with an additional Pinhole Array (opposite the
blade pairs).

AlN insulators / ZrO washers: 0.5 mm AlN / ZrO-collar sleeves

Base flange / installation depth: Preferable DN 150 CF / 167mm

Stand: Steel, sand filled,
polystyrene-insulated (according to special request)

Vertical / horizontal stroke: manual adjustment: ± 10mm (x-, y-, z- direction)

Electronics: 4 channel-current to DC converter LoCuM-4
(100pA…1mA),
internal BIAS supply (300V DC)

As options available: Vacuum chamber with bellows (hydro formed or welded
Bellows)
The additional consideration of the precision stage is also
possible: ±5mm (x-, z- direction)

UHV compatibility: yes


 



Diagnosekomponenten


Profilmonitor

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Technische Beschreibung


The profile monitor is used for detecting beam profiles at a high spatial resolution.
GaAsP photodiodes (Schottky type) in a UHV-compatible design will be used as sensors. The resolution of 50 μm is achieved by pin holes of the same diameter installed before the photodiode.
For measurements in the white light mode a filter is installed before the pin holes and the diode. The cooled monitor head is made of OFHC copper and can be moved via a power-driven manipulator either in a linear motion or in two coordinates orthogonally to the beam. The manipulator stroke allows the use of three measuring points of selectable configuration as well as the complete removal of the monitor out of the beam. The expected photon flows will be measured using pico-ammeters.
Its overall transmission amounts up to 40%.

Technische Daten


Energy range: 1 keV … 20 keV

Diode type: GaAsP, Schottky type (Hamamatsu)

Active diode surface: 2.3 mm x 2.3 mm

Basic flange: CF 100

Monitor head: OFHC copper

Manipulator stroke: 100 mm vertical,
10 mm horizontal

Drive: stepping motor,
encoder with integrated references,
limit switch

Cooling: 2 symmetric circulations with OFHC copper pipe, Ø 6x1

Temperature measurement: 2 TC, K-type

Camera: CCD camera (monochrome) with lens
(optional motor zoom), 752 x 582 pixel
Camera – screen distance: approx. 500 mm

Photo-current measurement: 2 pico-ammeters (Keithley 6485 or equivalent)

UHV compatibility: yes


 

Intensity Monitor

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Technische Beschreibung


The intensity monitor is used for in-situ measurement of the photon flow and can be used in a broad energy range. Photons hit an isolated, stretched-out net which is connected to an ammeter, and generate an external photoelectrical effect.
Electrons leave the net and lead to an electrical current as a measure of the photon flow. In order to allow the use of different net materials and net dimensions the monitor has receptacles for two nets. The cooled monitor head is installed on a linear travel mechanism. Thus the two nets can be moved into different beam positions or completely removed out of the beam. In order to improve the electron yield the nets are BIAS-compatible.

Technische Daten


Energy range: 1 keV … 20 keV

Nets: tungsten, gold, copper, nickel

Net size: Ø 12 mm

Transmission: > 75 %

Electrical feedthrough: x floating shield

Basic flange: CF 100

Monitor head: OFHC copper

Manipulator stroke: 50 mm vertical

Drive: stepping motor, limit and reference switches

Cooling: OFHC copper pipe, Ø 6x1

Temperature measurement: TC, K-type

Photo-current measurement:
1 pico-ammeter (e.g. Keithley 6487 or equivalent)

UHV compatibility: yes


 

Fluorescence Monitor

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Technische Beschreibung


The fluorescence monitor generates a fluorescent radiation on a screen which can be monitored orthogonally to the synchrotron beam via a CCD camera outside the vacuum. The screen consists of a CVD-deposited diamond foil with a very high thermal conductivity. Thus this monitor can be used at very high thermal loads (> 1 kW). The monitor head is cooled. It can be adjusted to different beam positions using a power-driven linear drive or even completely moved out of the beam.
The fluorescent effect of CVD diamond is based on its residual doping with nitrogen atoms. As an alternative the screen can be delivered with a classic P43 coating in order to visualize weak photon flows (e.g. in monochromatized radiation). In-situ operation is possible because the diamond foil is just 0.15 mm thick.
Its overall transmission amounts up to 40%.

Technische Daten


Energy range: 1 keV … 20 keV

Active screen surface: 20 mm x 15 mm

Diamond foil thickness: 0.15 mm

Coating: w/o coating, P43, split screen: w/o coating and P43

Basic flange: CF 100

Monitor head: OFHC copper

Manipulator stroke: 50 mm

Drive: stepping motor, limit and reference switches

Cooling: 2 symmetric circulations with OFHC copper pipe, Ø 6x1

Temperature measurement: 2 TC, K-type

Camera: CCD camera (monochrome) with lens
(optional motor zoom), 752 x 582 pixel
Camera – screen distance: approx. 500 mm

UHV compatibility: yes